When Earth's atmosphere formed?

Answer 1

Depends on what you want to define as "atmosphere".

The first signs of a type of atmosphere occurred approximately 10 million years when the Earth started to form a cloud of gaseous silica.

When the Earth was about 40% its present radius, gravitational attraction would have been sufficient to retain an atmosphere which would included water.

Answer 2

Earth's atmosphere formed as the Earth cooled after its formation. The first atmosphere was mainly gasses ejected from volcanoes and contained a lot of hydrogen sulfide, methane, and carbon dioxide.

Answer 3

The atmosphere is an envelope of different gases that surrounds the earth used by life as a reservoir of chemical compounds used in living systems. The atmosphere has no outer boundary just fades into space. The Atmosphere has about the same thickness as continental crust.

Answer 4

The atmosphere is believed to have been formed in the first 500 million years after the formation of the earth. The earth on the hand is believed to have been formed about 5 billion years ago.

Answer 5

An atmosphere is defined as a layer of gas surrounding a large solid mass. To know when the first atmosphere formed we would need a detailed history of universe down to a planetary level. Humanity is limited in our ability to observe the distant reaches of the universe. We are only beginning to develop the tools necessary to understand and quantify the heavens. It is unlikely that we will ever know the specifics of the first atmosphere in the universe.

The earths first atmosphere was most likely hydrogen and helium, the most common elements in the universe crucial in our planets formation around 4.5 billion years ago.

Answer 6

the atmosphere formed after the ocean so about 3 billion years ago

Answer 7

Precambrian

Answer 8

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